Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Dye-sensitized solar cells (DSSCs) remain a promising photovoltaic technology with record efficiencies well above 10% related to significant advances in the field of cell design, materials science, sensitizers and redox chemistry. The development of efficient DSSCs with lower production costs involves the optimization of all processing steps and components used. As an alternative to TiO2, ZnO is an n-type material with a band gap similar to that of TiO2 and a higher electron mobility (200 cm2V-1s-1). ZnO can be synthesized by a variety of techniques including sol-gel precipitation, hydrothermal synthesis and electrochemical methods, where electrodeposition is an attractive technique due to its high deposition speed, good control over thickness and morphology of the film as well as attractive working conditions, such as low pressure and temperature.
In this work, mesoporous, nanostructured ZnO films were electrodeposited from ZnCl2 solutions, and DSSCs were assembled using the organic OD-8 dye, and two redox couples: I-/I3- and the cobalt-based redox couple [Co(2,2'-bipyridyl)3]3+/2+. Surface photovoltage spectroscopy was employed to observe photochemical charge separation at the ZnO/dye, ZnO/electrolyte and dye/electrolyte interfaces, and to determine the built-in voltage at each contact. The optoelectronic transition energy of the dye and the effect of dye aggregation on the photochemical charge transfer at the ZnO/dye interface have been directly observed. We show that the use of the [Co(bpy)3]3+/2+ redox couple results in a higher photovoltage as compared to I-/I3- . The photovoltage can be improved by the increase of dye concentration but this is also found to promote self-oxidation of the dye and, as a consequence, a reduction in device performance.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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